Two long parallel plates with diffuse black surfaces are facing each other as shown in the schematic. Assume both surfaces are isothermal and convection heat transfer is negligible. Please calculate the net radiation heat flux from A to Az.

Elements Of Electromagnetics
7th Edition
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Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Hi can you assist me with my Hw problem by using the formula provided and the fig
View factor F₁2 of F12
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
8
7
63
5
4
3
-1
1
When all the other surfaces in
an enclosure are adiabatic
2
2.
-S
Ratio,
Curves
for F
P
1
2
3
4
Dias Disks
one length
L
Shape
3
4
Diameter or shorter side
Distance between planes
Squares
L
Law Rectangles, = 2 (1711-
W
L
Rectangles,
W
5
a
all surface adiabatic
Compete enclouse
bacCurves
for F
=∞
5
6
67
8
7
Fig. 16.4-4. View factors for direct radiation between opposed identical shapes
in parallel planes. [H. C. Hottel, Chapter 3 in W. H. McAdams Heat Transmission,
McGraw-Hill, New York (1954), Third Edition, p. 69.]
Transcribed Image Text:View factor F₁2 of F12 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 8 7 63 5 4 3 -1 1 When all the other surfaces in an enclosure are adiabatic 2 2. -S Ratio, Curves for F P 1 2 3 4 Dias Disks one length L Shape 3 4 Diameter or shorter side Distance between planes Squares L Law Rectangles, = 2 (1711- W L Rectangles, W 5 a all surface adiabatic Compete enclouse bacCurves for F =∞ 5 6 67 8 7 Fig. 16.4-4. View factors for direct radiation between opposed identical shapes in parallel planes. [H. C. Hottel, Chapter 3 in W. H. McAdams Heat Transmission, McGraw-Hill, New York (1954), Third Edition, p. 69.]
Two long parallel plates with diffuse black surfaces are facing each other as shown in the
schematic. Assume both surfaces are isothermal and convection heat transfer is
negligible. Please calculate the net radiation heat flux from A to Az.
1m
5m
T₁ = 427 °C
-T₂-327 °C -
Radiation Between Black Bodies
▸ The net heat transfer rate from body 1 to body 2:
Curves 1, 2, 3, 4
Q12 = A₁F₁20(T₁-T₂) = A₂F₂0(T₁ - TÂ)
Grad = Q₁-02-Q2-01-
7ook
600 K
Chore, que post you
Q12 = A₁F120(T₁ - T₁) = A₂F₂₁0(T₁ – T₂)
(16.4-9)
2A,Ti F₁₂-2A₂ T₂. F21
=&A₁ F₁₂ (7₁" -T₂")
▸ If a set of black surfaces 1, 2, ..., n form the walls of a
compete enclosure, but surfaces 3, 4, ..., n are adiabatic:
Curves 5,6,7,8
(16.4-15)
$60
SE combeLCALE
See Fig. 16.4-4 (works only when the adiabatic walls are formed
from line elements perpendicular to surfaces I and 2)
Transcribed Image Text:Two long parallel plates with diffuse black surfaces are facing each other as shown in the schematic. Assume both surfaces are isothermal and convection heat transfer is negligible. Please calculate the net radiation heat flux from A to Az. 1m 5m T₁ = 427 °C -T₂-327 °C - Radiation Between Black Bodies ▸ The net heat transfer rate from body 1 to body 2: Curves 1, 2, 3, 4 Q12 = A₁F₁20(T₁-T₂) = A₂F₂0(T₁ - TÂ) Grad = Q₁-02-Q2-01- 7ook 600 K Chore, que post you Q12 = A₁F120(T₁ - T₁) = A₂F₂₁0(T₁ – T₂) (16.4-9) 2A,Ti F₁₂-2A₂ T₂. F21 =&A₁ F₁₂ (7₁" -T₂") ▸ If a set of black surfaces 1, 2, ..., n form the walls of a compete enclosure, but surfaces 3, 4, ..., n are adiabatic: Curves 5,6,7,8 (16.4-15) $60 SE combeLCALE See Fig. 16.4-4 (works only when the adiabatic walls are formed from line elements perpendicular to surfaces I and 2)
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